Nanbu碰撞算法在非Spitzer系统中的推广及其在Laser加热和损伤中的应用
Extending the Nanbu Collision Algorithm to Non-Spitzer Systems and Application to Laser Heating and Damage
摘要：
我们推广了Nanbu碰撞算法，以适应任意的碰撞率，使非斯皮策系统中的短程粒子相互作用的精确动力学建模。通过这种扩展，我们探索了不同碰撞模型对超强激光如何首先开始加热目标的模拟的影响。碰撞对等离子体演化的影响对于处理粒子慢化、能量输运和热化是至关重要的。广泛使用的Nanbu碰撞算法提供了一种快速且计算有效的方法，以在动力学模拟中包括带电粒子之间的碰撞效应，而不需要粒子已经处于局部热平衡。然而，它是“硬连线”使用斯皮策碰撞率适合于热，相对稀等离子体。这一限制使得Nanbu碰撞算法不能准确描述冷靶的初始加热，而这是研究激光损伤或热致密物质态产生的关键问题。我们描述了我们的方法修改南部碰撞算法，并证明了铜目标的精度提高。
英文摘要：
We have generalized the Nanbu collision algorithm to accommodate arbitrary collision rates, enabling accurate kinetic modeling of short range particle interactions in non-Spitzer systems. With this extension, we explore the effect of different collision models on the simulation of how ultra-intense lasers first begin to heat a target. The effect of collisions on plasma evolution is crucial for treating particle slowing, energy transport, and thermalization. The widely used Nanbu collision algorithm provides a fast and computationally efficient method to include the effects of collisions between charged particles in kinetic simulations without requiring that the particles already be in local thermal equilibrium. However, it is "hardwired" to use Spitzer collision rates appropriate for hot, relatively dilute plasmas. This restriction prevents the Nanbu collision algorithm from accurately describing the initial heating of a cold target, a key problem for the study of laser damage or the generation of the warm dense matter state. We describe our approach for modifying the Nanbu collision algorithm and demonstrate the improved accuracy for copper targets.
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